A few things

The "there is no ethical consumption under captilaism" as a get out of jail free for trying to do better is just a nothing. We should all be, within our capabilities, trying to ensure we aren't at the very least direct financial supporters of evil companies.

Re: no trans person you know (...)

I'm a trans person I know, I go nuclear about jkr and harry potter, and I also go nuclear about the support and usage of meta products, purchasing of games from corps like actiblizz, ubi, ea, square, Microsoft, etc, Minecraft, discord, etc etc etc. I'm in the minority of the minority, sure. But most people don't have the emotional or mental energy to "fight that many battles" at once, much less to convince others to do so.

The fact that most people might stop at hating jkr and HP isn't evidence that they're wrong or something. Its just a symptom of how well known it is that jkr and her products harm trans people. Fewer people know (or, have internalised) that the other examples are bad.

I think people should feel shame if they're giving money to jkr or otherwise promoting her presence. I also think it would be good if more people were taking stands against more things, but jkr's a good start